Written in Greek despite being Roman emperor, Marcus addresses himself, reminding himself of principles to maintain virtue amid power's corruptions and war's hardships. The work is organized into twelve books covering themes like mortality, duty, providence, and the proper use of reason.
What makes Meditations extraordinary is its author. Here is the most powerful man in the world counseling himself to remain humble, just, and grateful. He reminds himself that death comes to emperor and peasant alike, that reputation is worthless, that only virtue and right action matter.
The text's fragmentary nature—sometimes appearing as disconnected aphorisms—reflects its origin as a working journal rather than systematic treatise. This gives it immediacy and authenticity; we witness a human being struggling to live philosophy in real conditions.
Meditations has become one of Stoicism's most influential texts, prized for its practical wisdom and Marcus's example of philosophy lived under pressure.
Source
Meditations - Marcus Aurelius